Method for improving recovery ratio of oil field by use of blasting type pre-crosslinking gel particles

A gel particle, recovery factor technology, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve the problems of large loss of effective viscosity, difficult on-site implementation, and inability to achieve results by water flooding. The effect of shear thinning and enhanced oil recovery
CN102587876AActive Publication Date: 2012-07-18PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2012-07-18

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Abstract

The invention provides a method for improving the recovery ratio of an oil field by use of blasting type pre-crosslinking gel particles, and particularly relates to a method for improving the recovery ratio of an old oil field with high water cut. The method adopts a kind of pre-crosslinking gel particles; the pre-crosslinking gel particles absorb water to expand and form a solution after staying for a certain time at the formation temperature and pH condition; and the method for improving the recovery ratio of an old oil field with high water cut comprises the following steps of: mixing the pre-crosslinking gel particles with water so that the pre-crosslinking gel particles absorb water to expand; injecting the pre-crosslinking gel particles underground so that the pre-crosslinking gel particles firstly block big pore channels and ultrahigh-permeability layers near the well in an oil pool, wherein after the pre-crosslinking gel particles experience the action of the oil pool temperature for a certain time, the gel particles automatically blast to form a polymer viscose solution which enters the deep of the oil pool to realize control on oil-water fluidity; and performing oil extraction. The method provided by the invention is suitable for improving the petroleum recovery ratio of the oil pool at the stage of high water cut.
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Description

technical field

[0001] The present invention relates to a method for increasing the recovery rate of an oilfield, especially an old oilfield with a high water content, in oil exploitation, and in particular to a method for improving the recovery rate of an oilfield by using a blasting pre-crosslinked gel particle with dual functions of profile control and polymer flooding method. Background technique

[0002] With the continuous development of the oil field, the heterogeneity of the reservoir is becoming more and more serious. A large amount of injected water scours, the clay and cement in the oil layer expand and dissolve, the migration of particles, and the sand production become heavier, which further deteriorates the geological heterogeneity. During the development process, the following problems often appear, such as: prominent plane contradictions, plane injection water rushes along the high permeability zone to form waterways; prominent interlayer contradictions, unev...

Claims

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